/Engine/Source/Editor/UnrealEd/Public/FileHelpers.h
Sets the active level filename so that "Save" operates on this file and "SaveAs" must be used on others
static void RegisterLevelFilename ( [UObject](API\Runtime\CoreUObject\UObject\UObject) * Object, const [FString](API\Runtime\Core\Containers\FString) & NewLevelFilename )